#include <iostream>
using namespace std;

class Line {
    public:
        void setLength(double len);
        double getLength(void);
        Line();  //构造函数声明
        ~Line(); //析构函数声明

    private:
        double length;
};

Line::Line(void){
    cout << "Object is being created" << endl;
}
Line::~Line(void){
    cout << "Object is being deleted" << endl;
}

void Line::setLength(double len){
    length = len;
}

double Line::getLength(void){
    return length;
}

int main() {
    Line line;

    line.setLength(6.0);
    cout << "Length of line: " << line.getLength() << endl;

    return 0;
}